president obama got a warm welcome and greeted the mandela family before he took the podium to pay tribute. at one point the president openly challenged the other world leaders that were in the audience with him. >> there are too many people who happily embrace mandela's dream of reconciliation but passion resists even modest reforms that would challenge growing inequality. there are too many leader who is claim solidarity with his struggle for freedom but do not tolerate the same from their own people. and there are too many of us, too many of us on the sidelines, comfortable in complacency or cynicism when our voices must be heard. >> after sending that message to world leaders, the president finished on a personal note. >> and while i will always fall short of madiba's example, he makes me want to be a better man. he speaks to what's best inside us. >> leaders from china, namibia, cuba, were also invited to speak. in fact, at one point, you saw president obama shaking hands with cuba's president, castro. when south africa's current president took the stage, you could hear the crowd booi